Princeton: RCA Corporation of America, RCA Laboratories Division, 1951. Soft cover. First booklet format, published by RCA Laboratories, of a paper first printed in RCA Review, March 1951, Vol XII No 1. Printed covers, stapled spine, illustrated, paginated 53-97. WorldCat lists this paper by Rajchman, but not this particular booklet. Curiously, in either case, it does not identify any library with the holding. In this paper, computer pioneer Rajchman puts forth his invention of the elective electrostatic storage tube, which represented the first truly digital, random-access high-speed memory. The storage capacity for each tube was 256 bits.  Later Rajchman began to look at magnetic devices, and conceived of the use of the hysteresis loop of toroids as a memory system. The cores were squeezed into shape using a converted aspirin tablet press. Jay Forrester and the group at MIT (including An Wang) achieved a similar result and eventually got into a patent dispute with the RCA Laboratories. The early core memory matrices contained 10,000 bits, which Rajchman termed a myriabit.  Jan A. Rajchman (1911 - 1989)  was the  RCA inventor of the Selectron, which was used in the JOHNNIAC as the memory system and inventor of the basic concepts of core memories.  Of Polish origin, Rajcjman emigrated to the US in 1935 After a summer at MIT, RCA employed him in the Testing Department, where he matched the variable condensers for superheterodyne radio receivers to standards, by bending plates by hand. In January 1936 he joined Vladimir K. Zworykin's laboratory in Camden, NJ. His first research was in electron photomultiplier tubes, to which he applied electrostatic rather than magnetic focusing. The determination of the electron trajectories in the fields of complex electrodes was beyond the computational capabilities of the day, and he resorted to modeling the electron paths by rolling small steel ball bearings on stretched rubber sheets. He designed an intricate system of dynodes to keep gas ions from feeding back to the cathode, which removed the main causes of dark current that set the lower limit of light detection for these phototubes. His designs, which formed the basis of his doctoral thesis, are still the mainstay of present-day multipliers. In 1961 Rajchman became director of the Computer Research Laboratory, but eventually RCA departed from the computer field and Rajchman, after spending a year at UC Berkeley, became an independent industry consultant, continuing to make inventions and receive patents. (Source: IEEE Computer Society History Committee, Computer Pioneers by J. A. N. Lee). Near Fine. Item #012419

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